og94，一道简单的题目，但我被时态弄晕了。。。

94.   The psychologist William James believed that facial expressions not only provide a visible sign of an emotion, actually contributing to the feeling itself.

(A) emotion, actually contributing to the feeling itself

(B) emotion but also actually contributing to the feeling itself

(C) emotion but also actually contribute to the feeling itself

(D) emotion; they also actually contribute to the feeling of it（C）

(E) emotion; the feeling itself is also actually contributed to by them

我对答案没有任何异议，只有一事不明，主句是过去时，从句为何可用一般时啊？这里不是表真理和普遍规律啊？是因为not？如果这里有助动词，比如说did ,那provide肯定用原形，可在没有助动词，只有not的情况下，provide 可用原形吗？后面的contribute呢？

过去式讲不同啊，难道面部表情只在过去not only....but also....?

菜鸟鸟这里觉得算是规律了。

一般现在时表真理及普遍规律，或者说话或发表意见的人认为是普遍真理和事实，都可以这么用。这是个常用的语法现象，不仅是gmat的语法现象。

不仅said和believed可以，还有许多类似的词，应该都可以.

The psychologist William James believed that facial expressions not only provide a visible sign of an  emotion but also actually contribute to the feeling itself

想知道的是在but also前面不用加一个逗号吗？？变成

The psychologist William James believed that facial expressions not only provide a visible sign of an  emotion    ， but also actually contribute to the feeling itself

The psychologist William James believed that facial expressions not only provide a visible sign of an  emotion    ， but also actually contribute to the feeling itself

另外这里的itself指的是什么呢，？

谢谢。

就是feeling啊...

og里面有的题目加逗号 有的没加

想必是都行吧

mm真仔细